Brazil's Biggest Bitcoin Exchange Says It Will Refund Users After a $40 Million Hack

Decrypt11-03 18:16

In brief Mercado Bitcoin, Brazil's largest crypto exchange, says its customers won't bear the cost of a hack that hit its systems on November 2. Loss estimates differ: the exchange says about $38 ...

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Mercado Bitcoin, which lost tens of millions of dollars on Monday, says the losses are its problem, not its customers'.\nAn exchange holds your coins the way a bank holds your cash, and when one gets robbed, the customers are often the ones left waiting to see what they get back.\nThe exchange spotted a breach early on November 2 and froze deposits and withdrawals. “We identified and quickly contained a security incident in on...","collect":0,"end_time":0,"defaultTopTitle":"decrypt.co","property":[],"viewcount":null,"language":"en","relate_stocks":{"CBOY":"Calamos Bitcoin Structured Alt Protection ETF - July","BTCZ":"T-Rex 2X Inverse Bitcoin Daily Target ETF","CBXJ":"Calamos Bitcoin 90 Series Structured Alt Protection ETF - January","MNRS":"GRAYSCALE BITCOIN MINERS ETF","EZBC":"比特币ETF-Franklin","BITO":"比特币期货ETF-ProShares","FBTC":"比特币ETF-Fidelity","XBTY":"GraniteShares YieldBOOST Bitcoin ETF","BTC":"Grayscale Bitcoin Mini Trust","CBXO":"Calamos Bitcoin 90 Series Structured Alt Protection ETF - October","BAGY":"Amplify Bitcoin Max Income Covered Call ETF","BRRR":"比特币ETF-CoinShares","BPI":"Grayscale Bitcoin Premium Income ETF","BFAP":"FT Vest Bitcoin Strategy Floor15 ETF - April","BTCC":"Grayscale Bitcoin HIGH Income ETF","CBXY":"Calamos Bitcoin 90 Series Structured Alt Protection ETF - July","ARKB":"比特币ETF-21Shares","CBOA":"Calamos Bitcoin Structured Alt Protection ETF - April","BITU":"2倍做多比特币期货ETF-Proshares","BTCI":"NEOS Bitcoin High Income ETF","YBTC":"比特币看涨期权ETF-Roundhill","QBF":"Innovator Uncapped Bitcoin 20 Floor ETF - Quarterly","BTF":"比特币&以太币期货ETF-CoinShares","CBXA":"Calamos Bitcoin 90 Series Structured Alt Protection ETF – April","CBOJ":"Calamos Bitcoin Structured Alt Protection ETF - January","CBTA":"Calamos Bitcoin 80 Series Structured Alt Protection ETF – April","BCCC":"Global X Bitcoin Covered Call ETF","GBTC":"比特币ETF-Grayscale","CBTJ":"Calamos Bitcoin 80 Series Structured Alt Protection ETF - January","BITX":"2倍比特币期货ETF-Volatility Shares","BTCL":"T-REX 2X LONG BITCOIN DAILY TARGET ETF","IBIT":"比特币ETF-iShares","DEFI":"比特币期货ETF-Hashdex","BITY":"Amplify Bitcoin 2% Monthly Option Income ETF","BTRN":"比特币期货ETF-Global X","BTCO":"比特币ETF-Invesco Galaxy","BITB":"比特币ETF-Bitwise","SBIT":"2倍做空比特币期货ETF-Proshares","CBOO":"Calamos Bitcoin Structured Alt Protection ETF - October","CBTO":"Calamos Bitcoin 80 Series Structured Alt Protection ETF - October","MAXI":"比特币期货ETF-Simplify","BITC":"Bitwise Trendwise Bitcoin and Treasuries Rotation Strategy ETF","HODL":"比特币ETF-VanEck","BETE":"等权重比特币&以太币期货ETF-ProShares","BFJL":"FT Vest Bitcoin Strategy Floor15 ETF - July","BETH":"比特币&以太币期货ETF-ProShares","BTCW":"比特币ETF-Wisdom Tree","BITI":"1倍做空比特币期货ETF-Proshares"},"translate_title":"巴西最大的比特币交易所表示，在遭受 4000 万美元黑客攻击后，将向用户退款","themeId":null,"isJumpTheme":false,"ttsUrl":null,"symbols_score_info":{"CBOY":0.6,"BITC":0.6,"CBTA":0.6,"BITY":0.6,"CBTJ":0.6,"IBIT":0.6,"BPI":0.6,"CBXA":0.6,"BTCW":0.6,"CBXO":0.6,"BTRN":0.6,"BTF":0.6,"BITX":0.6,"GBTC":0.6,"HODL":0.6,"CBXY":0.6,"EZBC":0.6,"BTC":0.6,"CBTO":0.6,"BITU":0.6,"BTCI":0.6,"BCCC":0.6,"BRRR":0.6,"BFAP":0.6,"BTCO":0.6,"DEFI":0.6,"BFJL":0.6,"BTCZ":0.6,"BTCL":0.6,"MNRS":0.6,"XBTY":0.6,"SBIT":0.6,"BITO":0.6,"CBOJ":0.6,"CBXJ":0.6,"BETE":0.6,"BTCC":0.6,"YBTC":0.6,"BITB":0.6,"MAXI":0.6,"FBTC":0.6,"ARKB":0.6,"BAGY":0.6,"CBOO":0.6,"CBOA":0.6,"QBF":0.6,"BITI":0.6,"BETH":0.6},"content_text":"In brief\nMercado Bitcoin, Brazil's largest crypto exchange, says its customers won't bear the cost of a hack that hit its systems on November 2.\nLoss estimates differ: the exchange says about $38 million, Hypernative more than $40 million, Arkham at least $46 million and Chainalysis about $49 million.\nDeposits and withdrawals remain suspended with no restart date, days after a $6 billion theft at Binance that the FBI blamed on North Korea.\nBrazil's largest crypto exchange says its users won't pay for its hack. Mercado Bitcoin, which lost tens of millions of dollars on Monday, says the losses are its problem, not its customers'.An exchange holds your coins the way a bank holds your cash, and when one gets robbed, the customers are often the ones left waiting to see what they get back.The exchange spotted a breach early on November 2 and froze deposits and withdrawals. “We identified and quickly contained a security incident in one of our systems early this morning,” Mercado Bitcoin said in a Portuguese-language statement on X. “As a preventive protection measure, deposits and withdrawals are temporarily suspended.”Predict·CryptoBTC Highs in November80,00077%YesNo82,50056%YesNo85,00038%YesNo87,50024%YesNo90,00014%YesNo+6 more outcomes+5 more outcomesNEW$0.00 volumeDec 1Closes: Dec 1, 2026, 04:59 UTCCloses: Dec 1, 2026, 04:59 UTCIt said no customer lost money and no data leaked. It has not said how the attackers got in.How much was taken depends on who is counting. Security firm Hypernative flagged more than $40 million in suspicious transfers across at least 10 blockchains, including Bitcoin, Ethereum, Solana, and Tron.\nOlá.\nPrimeiro, o mais importante: os ativos dos clientes estão garantidos . Os saldos continuam registrados nas respectivas contas.\nOntem (2/11), identificamos um incidente de segurança. Acionamos na hora nossos protocolos de segurança e governança e informamos as autoridades.…\n— Mercado Bitcoin (@MercadoBitcoin) November 3, 2026The exchange's own number is lower. “Right now the value of the assets involved is about $38 million,” Mercado Bitcoin said in a Portuguese-language update on X. “After a quick action with the crypto community and strategic partners, including Tether, Circle, Paxos, BRL1 and Chainalysis, we have already blocked $11 million.”Others put it higher. Blockchain analysts at Arkham traced at least $46 million, while Chainalysis says about $49 million, with nearly $10 million frozen. The exchange has not said whether its $38 million includes the frozen amount.Tether, which issues the USDT stablecoin (a token pegged to the dollar), froze more than $4.5 million in USDT tied to the incident, CEO Paolo Ardoino said on X.A freeze only stops the tokens from moving. It doesn't return them to their owner, which is why the exchange's promise to cover losses carries the weight here.BitcoinBTC · USD$77,720−3.6%24H7D1M1YYTDOct 27Oct 29Oct 31Nov 2Nov 3$81.8k$80.0k$78.3k$76.6k24h HighHigh$77,70824h LowLow$76,303VolVol$1.0B→Buy Bitcoin with USDCPowered by Jupiter$50$100$500BuyPrice data by CoinGeckoCoinGeckoMore Bitcoin news and projections →On October 29, hackers drained more than $6 billion from Binance, the world's biggest exchange, and the FBI blamed North Korea's TraderTraitor group. Mercado Bitcoin has not linked its incident to that attack.Binance made the same pledge as Mercado Bitcoin. “Binance will absorb the financial impact of the stolen funds, not our users,” CEO Richard Teng wrote on X, adding that about 95% of the affected assets had been replenished.Neither promise can be checked from the outside. A guarantee to cover losses is only as good as the money behind it, and exchanges don't have to show customers their books.For now, Mercado Bitcoin deposits and withdrawals remain suspended with no restart date. The exchange says it will post updates on X and resume service once full security is restored.Daily Debrief NewsletterStart every day with the top news stories right now, plus original features, a podcast, videos and more. 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